from manim import *
class TextTest(Scene):    
    def construct(self):        
        s1 = Text("单位圆")        
        s1.to_edge(UP,buff=0.5)        
        t1 = Tex(r"$x^2 + y^2 = 1$",font_size=80).next_to(s1,DOWN)        
        s2 = Text("欧拉公式").next_to(t1,DOWN)        
        t2 = Tex(r"$e^{i\pi} + 1 = 0$").next_to(s2,DOWN)        
        self.add(s1)        
        self.play(Write(t1))        
        self.add(s2)        
        self.play(Write(t2))